A vaccine has the potential to protect many people from this devastating virus, but it will take time for it to work, says Julian Daniel Sunday Willett.

But what is a Phase 3 clinical study? Charles Weijer, professor at Western University, explains.

Although every country had the right to approve drugs without completing full trials, "it is not something that you do very lightly," WHO said.

The CanSino vaccine intended for phase one clinical trials has not been approved by Chinese customs for shipment to Canada.

People on six continents already are getting jabs in the arm as the race for a COVID-19 vaccine enters a defining summer, with even bigger studies poised to prove if any shot really works -- and maybe offer a reality check.

The findings land just before researchers at Dalhousie University test the same vaccine in Halifax in the upcoming weeks.

British researchers testing an experimental vaccine against the new coronavirus aim to immunize more than 10,000 people to find out if it works.